Entablatures for piston engines



Oct. 31, 1967 A. G. HELLSTROM ENTABLATURES FOR PISTON ENGINES 2 Sheets-Sheet 1 Filed May 20, 1966 FIG.1

Axel. Gunnar HeLLsfir O 31, 1967 A. G. HELLSTROM 3,349,761

ENTABLATURES FOR PISTON ENGINES Filed May 20, 1966 v 2 Sheets-Sheet 2 INVENTOR. AxeL Gun nar HeLLsrb'm BY PM JWXOPM-W I Atto hegs 3,349,761 ENTABLATURES FOR PISTON ENGINES Axel Gunnar Hellstriim, Goteborg, Sweden, assignor to Aktiebolaget Gotaverken, Goteborg, Sweden, a corporafion of Sweden Filed May 20, 1966, Ser. No. 551,760 Claims priority, application Sweden, June 9, 1965, 7,542/ 65 3 Claims. (Cl. 123-195) The present invention refers to crosshead engines of the type, where each cylinder is supported by a box-like structure and where the crosshead guide belonging to the cylinder is supported from two opposed transverse walls of the entablatures.

In the design of entablatures for piston engines of considerable output per cylinder, for instance ships diesel engines, it has hitherto been considered necessary to design that part of the entablature, which is intended to take care of the lateral pressure of the crosshead, as a transversely strong beam. In a known design of boxlike entablatures the crosshead guide is supported by two vertical, comparatively strong beams one on each side at the transverse walls of the entablature, said beams reaching essentially over of the height thereof. It has been found, that a concentration of stresses will occur at the upper and the lower end of the beam, respectively. These stresses have brought about ruptures in the entablature, which local strengthening members have proven unsatisfactory to take care of. Investigations of the ruptures and the distribution of the stresses has shown that these beams have been too rigid.

The present invention aims at a design where the disadvantages above indicated are removed and which provides a design in which it by simple means will be possible to bring the major part of the transverse wall to take part in the distribution of the lateral forces. The brackets carrying the crosshead guide must however not be subjected to the considerable tensile stresses which during the working stroke of the piston will have to be transferred from the top of the engine to the bottom framing.

The invention is mainly characterized by that each transverse wall is provided with a number of cross ties arranged one above the other, essentially at right angles to the wall and extending over a considerable part of the breadth thereof, said ties being interconnected by means of a rib runningalong the Wall, a bracket for the crosshead guide being arranged on the edge of each tie at the intersection of the tie and 11b.

The invention will below be described with reference to an embodiment shown on the accompanying drawing.

FIGURE 1 shows a section through a box-like entablature according to the invention.

FIGURE 2 is a vertical section along line II-II in FIGURE 1.

FIGURE 3 is a horizontal section along line III-III in FIGURE 1, and

FIGURE 4 shows in perspective a detail of the bracket according to the invention.

The entablature of the engine rests in a known manner on a bottom framing and consists of a number of box-like units bolted together. Each of these units is i United States Patent designed to carry one engine cylinder. A unit consists of four side plates forming two lateral walls, 1 and 2, respectively, and two longitudinal walls, 3 and 4, respectively, which are welded together and provided with suitable stifiening members. The upper part of this boxlike unit is connected to a frame 5, which carries the cylinder proper (not shown) and which preferably is made from cast steel. The crosshead and parts of the piston rod and the connecting rod are shown to indicate the location of the parts cooperating with the crosshead guide 8.

In order to support the crosshead guide the lateral walls 1 and 2 are provided with a number of horizontal ties 6, which extend over a considerable part of the breadth of the wall. In the vertical direction these ties are interconnected by means of a rib 7, which mainly extends from the lower part of the entablature to horizontal wall portions in the upper part thereof. At the intersection between tie and rib bracket 9 for the crosshead guide 8 is arranged mainly resting on the ridge of the ties. The ties 6 as well as the rib 7 are welded to the transverse wall. The crosshead guide 8 is by means of bolts 10 connected to the brackets 9. The horizontal ties are extended to the nearest longitudinal wall 3, to which they are welded, whereas the other end of each tie smoothly merges into the transverse wall.

What I claim is:

1. In an entablature for a crosshead piston engine a box-like structure adapted to enclose and to carry each engine cylinder two transverse and two longitudinal walls as well as upper and lower horizontal wall portions in each box-like structure a number of cross ties arranged one above the other essentially at right angles to each of said transverse walls and extending over a considerable part of the breadth thereof a rib at each of said transverse walls at right angles to and intersecting said ties a bracket fitted on the ridge of each tie at the intersection of tie and rib a crosshead guide and means to detachably connect the crosshead guide to each bracket.

2. An entablature according to claim 1., characterized in that the ties extend to and are fixed to at least one of the longitudinal walls of the box-like structure.

3. An entablature according to claim 1, characterized in that the rib extends to and is fixed to at least one horizontal wall portion of the box-like structure.

References Cited UNITED STATES PATENTS 896,183 8/ 1908 Watres 123-74 1,143,649 6/1915 'Sandbo 123-74 1,284,255 11/191 8 Davison 92-147 1,753,925 4/1930 Gorr 92-147 1,969,031 8/1934 Pielstick 92-147 1,999,350 4/1935 Atteslander 74-44 XR 2,578,079 12/ 1 Meinertz 92147 WENDELL E. BURNS, Primary Examiner. 

1. IN AN ENTABLATURE FOR A CROSSHEAD PISTON ENGINE A BOX-LIKE STRUCTURE ADAPTED TO ENCLOSE AND TO CARRY EACH ENGINE CYLINDER TWO TRANSVERSE AND TWO LONGITUDINAL WALLS AS WELL AS UPPER AND LOWER HORIZONTAL WALL PORTIONS IN EACH BOX-LIKE STRUCTURE A NUMBER OF CROSS TIES ARRANGED ONE ABOVE THE OTHER ESSENTIALLY AT RIGHT ANGLES TO EACH OF SAID TRANSVERSE WALLS AND EXTENDING OVER A CONSIDERABLE PART OF THE BREADTH THEREOF A RIB AT EACH OF SAID TRANSVERSE WALLS AT RIGHT ANGLES TO AND INTERSECTING SAID TIES A BRACKET FITTED ON THE RIDGE OF EACH TIE AT THE INTERSECTION OF TIE AND RIB A CROSSHEAD GUIDE AND MEANS TO DETACHABLY CONNECT THE CROSSHEAD GUIDE TO EACH BRACKET. 